diff --git a/pkgs/development/compilers/swift/default.nix b/pkgs/development/compilers/swift/default.nix
index 845b91158495..83627130d405 100644
--- a/pkgs/development/compilers/swift/default.nix
+++ b/pkgs/development/compilers/swift/default.nix
@@ -88,6 +88,10 @@ let
       swift = swift-unwrapped;
     };
 
+    sourcekit-lsp = callPackage ./sourcekit-lsp {
+      inherit (apple_sdk.frameworks) CryptoKit LocalAuthentication;
+    };
+
   };
 
 in self
diff --git a/pkgs/development/compilers/swift/sourcekit-lsp/default.nix b/pkgs/development/compilers/swift/sourcekit-lsp/default.nix
new file mode 100644
index 000000000000..bf013a8f6e8e
--- /dev/null
+++ b/pkgs/development/compilers/swift/sourcekit-lsp/default.nix
@@ -0,0 +1,74 @@
+{ lib
+, stdenv
+, callPackage
+, fetchFromGitHub
+, swift
+, swiftpm
+, Foundation
+, XCTest
+, sqlite
+, ncurses
+, CryptoKit
+, LocalAuthentication
+}:
+let
+  # Generated by swiftpm2nix.
+  generated = callPackage ./generated { };
+
+  # On Darwin, we only want ncurses in the linker search path, because headers
+  # are part of libsystem. Adding its headers to the search path causes strange
+  # mixing and errors.
+  # TODO: Find a better way to prevent this conflict.
+  ncursesInput = if stdenv.isDarwin then ncurses.out else ncurses;
+in
+stdenv.mkDerivation rec {
+  pname = "sourcekit-lsp";
+
+  # Releases are made as part of the Swift toolchain, so versions should match.
+  version = "5.7";
+  src = fetchFromGitHub {
+    owner = "apple";
+    repo = "sourcekit-lsp";
+    rev = "swift-${version}-RELEASE";
+    hash = "sha256-uA3a+kAqI+XFzkDFEJ8XuRTgfYqacEuTsOU289Im+0Y=";
+  };
+
+  nativeBuildInputs = [ swift swiftpm ];
+  buildInputs = [
+    Foundation
+    XCTest
+    sqlite
+    ncursesInput
+  ]
+    ++ lib.optionals stdenv.isDarwin [ CryptoKit LocalAuthentication ];
+
+  configurePhase = generated.configure + ''
+    swiftpmMakeMutable indexstore-db
+    patch -p1 -d .build/checkouts/indexstore-db -i ${./patches/indexstore-db-macos-target.patch}
+
+    # This toggles a section specific to Xcode XCTest, which doesn't work on
+    # Darwin, where we also use swift-corelibs-xctest.
+    substituteInPlace Sources/LSPTestSupport/PerfTestCase.swift \
+      --replace '#if os(macOS)' '#if false'
+
+    # Required to link with swift-corelibs-xctest on Darwin.
+    export SWIFTTSC_MACOS_DEPLOYMENT_TARGET=10.12
+  '';
+
+  # TODO: BuildServerBuildSystemTests fails
+  #doCheck = true;
+
+  installPhase = ''
+    binPath="$(swiftpmBinPath)"
+    mkdir -p $out/bin
+    cp $binPath/sourcekit-lsp $out/bin/
+  '';
+
+  meta = {
+    description = "Language Server Protocol implementation for Swift and C-based languages";
+    homepage = "https://github.com/apple/sourcekit-lsp";
+    platforms = with lib.platforms; linux ++ darwin;
+    license = lib.licenses.asl20;
+    maintainers = with lib.maintainers; [ dtzWill trepetti dduan trundle stephank ];
+  };
+}
diff --git a/pkgs/development/compilers/swift/sourcekit-lsp/generated/Package.resolved b/pkgs/development/compilers/swift/sourcekit-lsp/generated/Package.resolved
new file mode 100644
index 000000000000..00f079308773
--- /dev/null
+++ b/pkgs/development/compilers/swift/sourcekit-lsp/generated/Package.resolved
@@ -0,0 +1,97 @@
+{
+  "object": {
+    "pins": [
+      {
+        "package": "IndexStoreDB",
+        "repositoryURL": "https://github.com/apple/indexstore-db.git",
+        "state": {
+          "branch": "main",
+          "revision": "2ff1c0491248cd958a2ac05da9aa613eb27a8eeb",
+          "version": null
+        }
+      },
+      {
+        "package": "swift-argument-parser",
+        "repositoryURL": "https://github.com/apple/swift-argument-parser.git",
+        "state": {
+          "branch": null,
+          "revision": "e394bf350e38cb100b6bc4172834770ede1b7232",
+          "version": "1.0.3"
+        }
+      },
+      {
+        "package": "swift-collections",
+        "repositoryURL": "https://github.com/apple/swift-collections.git",
+        "state": {
+          "branch": null,
+          "revision": "f504716c27d2e5d4144fa4794b12129301d17729",
+          "version": "1.0.3"
+        }
+      },
+      {
+        "package": "swift-crypto",
+        "repositoryURL": "https://github.com/apple/swift-crypto.git",
+        "state": {
+          "branch": null,
+          "revision": "ddb07e896a2a8af79512543b1c7eb9797f8898a5",
+          "version": "1.1.7"
+        }
+      },
+      {
+        "package": "swift-driver",
+        "repositoryURL": "https://github.com/apple/swift-driver.git",
+        "state": {
+          "branch": "main",
+          "revision": "6c71f58f89d65eb79f1f6b32a707ddc39cec5ad6",
+          "version": null
+        }
+      },
+      {
+        "package": "llbuild",
+        "repositoryURL": "https://github.com/apple/swift-llbuild.git",
+        "state": {
+          "branch": "main",
+          "revision": "d99c31577c60a247b065d29289a44fbdd141e2be",
+          "version": null
+        }
+      },
+      {
+        "package": "SwiftPM",
+        "repositoryURL": "https://github.com/apple/swift-package-manager.git",
+        "state": {
+          "branch": "main",
+          "revision": "f04ad469a6053d713c2fb854fbeb27ee3e6c9dee",
+          "version": null
+        }
+      },
+      {
+        "package": "swift-system",
+        "repositoryURL": "https://github.com/apple/swift-system.git",
+        "state": {
+          "branch": null,
+          "revision": "836bc4557b74fe6d2660218d56e3ce96aff76574",
+          "version": "1.1.1"
+        }
+      },
+      {
+        "package": "swift-tools-support-core",
+        "repositoryURL": "https://github.com/apple/swift-tools-support-core.git",
+        "state": {
+          "branch": "main",
+          "revision": "0220fc394f2ae820eeacd754fb2c7ce211e9979e",
+          "version": null
+        }
+      },
+      {
+        "package": "Yams",
+        "repositoryURL": "https://github.com/jpsim/Yams.git",
+        "state": {
+          "branch": null,
+          "revision": "01835dc202670b5bb90d07f3eae41867e9ed29f6",
+          "version": "5.0.1"
+        }
+      }
+    ]
+  },
+  "version": 1
+}
diff --git a/pkgs/development/compilers/swift/sourcekit-lsp/generated/default.nix b/pkgs/development/compilers/swift/sourcekit-lsp/generated/default.nix
new file mode 100644
index 000000000000..c7ce2361b8bf
--- /dev/null
+++ b/pkgs/development/compilers/swift/sourcekit-lsp/generated/default.nix
@@ -0,0 +1,72 @@
+# This file was generated by swiftpm2nix.
+{ lib, fetchgit }: rec {
+  sources = {
+    "indexstore-db" = fetchgit {
+      url = "https://github.com/apple/indexstore-db.git";
+      rev = "2ff1c0491248cd958a2ac05da9aa613eb27a8eeb";
+      sha256 = "005vvkrncgpryzrn0hzgsapflpyga0n7152b2b565wislpx90cwl";
+    };
+    "swift-argument-parser" = fetchgit {
+      url = "https://github.com/apple/swift-argument-parser.git";
+      rev = "e394bf350e38cb100b6bc4172834770ede1b7232";
+      sha256 = "1jph9w7lk9nr20fsv2c8p4hisx3dda817fh7pybd0r0j1jwa9nmw";
+    };
+    "swift-collections" = fetchgit {
+      url = "https://github.com/apple/swift-collections.git";
+      rev = "f504716c27d2e5d4144fa4794b12129301d17729";
+      sha256 = "0l0pv16zil3n7fac7mdf5qxklxr5rwiig5bixgca1ybq7arlnv7i";
+    };
+    "swift-crypto" = fetchgit {
+      url = "https://github.com/apple/swift-crypto.git";
+      rev = "ddb07e896a2a8af79512543b1c7eb9797f8898a5";
+      sha256 = "020b8q4ss2k7a65r5dgh59z40i6sn7ij1allxkh8c8a9d0jzn313";
+    };
+    "swift-driver" = fetchgit {
+      url = "https://github.com/apple/swift-driver.git";
+      rev = "6c71f58f89d65eb79f1f6b32a707ddc39cec5ad6";
+      sha256 = "0nblvs47kh2hl1l70rmrbablx4m5i27w8l3dfrv2h7zccqr8jl0a";
+    };
+    "swift-llbuild" = fetchgit {
+      url = "https://github.com/apple/swift-llbuild.git";
+      rev = "d99c31577c60a247b065d29289a44fbdd141e2be";
+      sha256 = "1bvqbj8ji72ilh3ah2mw411jwzbbjxjyasa6sg4b8da0kqia4021";
+    };
+    "swift-package-manager" = fetchgit {
+      url = "https://github.com/apple/swift-package-manager.git";
+      rev = "f04ad469a6053d713c2fb854fbeb27ee3e6c9dee";
+      sha256 = "16qvk14f1l0hf5bphx6qk51nn9d36a2iw5v3sgkvmqi8h7l4kqg5";
+    };
+    "swift-system" = fetchgit {
+      url = "https://github.com/apple/swift-system.git";
+      rev = "836bc4557b74fe6d2660218d56e3ce96aff76574";
+      sha256 = "0402hkx2q2dv27gccnn8ma79ngvwiwzkhcv4zlcdldmy6cgi0px7";
+    };
+    "swift-tools-support-core" = fetchgit {
+      url = "https://github.com/apple/swift-tools-support-core.git";
+      rev = "0220fc394f2ae820eeacd754fb2c7ce211e9979e";
+      sha256 = "1ryd5iyx5mfv8bhyq3bf08z7nv886chzzqnmwaj16r2cry9yml7c";
+    };
+    "Yams" = fetchgit {
+      url = "https://github.com/jpsim/Yams.git";
+      rev = "01835dc202670b5bb90d07f3eae41867e9ed29f6";
+      sha256 = "11abhcfkmqm3cmh7vp7rqzvxd1zj02j2866a2pp6v9m89456xb76";
+    };
+  };
+  configure = ''
+    mkdir -p .build/checkouts
+    ln -sf ${./Package.resolved} ./Package.resolved
+    install -m 0600 ${./workspace-state.json} ./.build/workspace-state.json
+  ''
+    + lib.concatStrings (lib.mapAttrsToList (name: src: ''
+      ln -s '${src}' '.build/checkouts/${name}'
+    '') sources)
+    + ''
+      # Helper that makes a swiftpm dependency mutable by copying the source.
+      swiftpmMakeMutable() {
+        local orig="$(readlink .build/checkouts/$1)"
+        rm .build/checkouts/$1
+        cp -r "$orig" .build/checkouts/$1
+        chmod -R u+w .build/checkouts/$1
+      }
+    '';
+}
diff --git a/pkgs/development/compilers/swift/sourcekit-lsp/generated/workspace-state.json b/pkgs/development/compilers/swift/sourcekit-lsp/generated/workspace-state.json
new file mode 100644
index 000000000000..4e8625ed0d6a
--- /dev/null
+++ b/pkgs/development/compilers/swift/sourcekit-lsp/generated/workspace-state.json
@@ -0,0 +1,178 @@
+{
+  "object": {
+    "artifacts": [],
+    "dependencies": [
+      {
+        "basedOn": null,
+        "packageRef": {
+          "identity": "indexstore-db",
+          "kind": "remoteSourceControl",
+          "location": "https://github.com/apple/indexstore-db.git",
+          "name": "IndexStoreDB"
+        },
+        "state": {
+          "checkoutState": {
+            "branch": "main",
+            "revision": "2ff1c0491248cd958a2ac05da9aa613eb27a8eeb"
+          },
+          "name": "sourceControlCheckout"
+        },
+        "subpath": "indexstore-db"
+      },
+      {
+        "basedOn": null,
+        "packageRef": {
+          "identity": "swift-argument-parser",
+          "kind": "remoteSourceControl",
+          "location": "https://github.com/apple/swift-argument-parser.git",
+          "name": "swift-argument-parser"
+        },
+        "state": {
+          "checkoutState": {
+            "revision": "e394bf350e38cb100b6bc4172834770ede1b7232",
+            "version": "1.0.3"
+          },
+          "name": "sourceControlCheckout"
+        },
+        "subpath": "swift-argument-parser"
+      },
+      {
+        "basedOn": null,
+        "packageRef": {
+          "identity": "swift-collections",
+          "kind": "remoteSourceControl",
+          "location": "https://github.com/apple/swift-collections.git",
+          "name": "swift-collections"
+        },
+        "state": {
+          "checkoutState": {
+            "revision": "f504716c27d2e5d4144fa4794b12129301d17729",
+            "version": "1.0.3"
+          },
+          "name": "sourceControlCheckout"
+        },
+        "subpath": "swift-collections"
+      },
+      {
+        "basedOn": null,
+        "packageRef": {
+          "identity": "swift-crypto",
+          "kind": "remoteSourceControl",
+          "location": "https://github.com/apple/swift-crypto.git",
+          "name": "swift-crypto"
+        },
+        "state": {
+          "checkoutState": {
+            "revision": "ddb07e896a2a8af79512543b1c7eb9797f8898a5",
+            "version": "1.1.7"
+          },
+          "name": "sourceControlCheckout"
+        },
+        "subpath": "swift-crypto"
+      },
+      {
+        "basedOn": null,
+        "packageRef": {
+          "identity": "swift-driver",
+          "kind": "remoteSourceControl",
+          "location": "https://github.com/apple/swift-driver.git",
+          "name": "swift-driver"
+        },
+        "state": {
+          "checkoutState": {
+            "branch": "main",
+            "revision": "6c71f58f89d65eb79f1f6b32a707ddc39cec5ad6"
+          },
+          "name": "sourceControlCheckout"
+        },
+        "subpath": "swift-driver"
+      },
+      {
+        "basedOn": null,
+        "packageRef": {
+          "identity": "swift-llbuild",
+          "kind": "remoteSourceControl",
+          "location": "https://github.com/apple/swift-llbuild.git",
+          "name": "llbuild"
+        },
+        "state": {
+          "checkoutState": {
+            "branch": "main",
+            "revision": "d99c31577c60a247b065d29289a44fbdd141e2be"
+          },
+          "name": "sourceControlCheckout"
+        },
+        "subpath": "swift-llbuild"
+      },
+      {
+        "basedOn": null,
+        "packageRef": {
+          "identity": "swift-package-manager",
+          "kind": "remoteSourceControl",
+          "location": "https://github.com/apple/swift-package-manager.git",
+          "name": "SwiftPM"
+        },
+        "state": {
+          "checkoutState": {
+            "branch": "main",
+            "revision": "f04ad469a6053d713c2fb854fbeb27ee3e6c9dee"
+          },
+          "name": "sourceControlCheckout"
+        },
+        "subpath": "swift-package-manager"
+      },
+      {
+        "basedOn": null,
+        "packageRef": {
+          "identity": "swift-system",
+          "kind": "remoteSourceControl",
+          "location": "https://github.com/apple/swift-system.git",
+          "name": "swift-system"
+        },
+        "state": {
+          "checkoutState": {
+            "revision": "836bc4557b74fe6d2660218d56e3ce96aff76574",
+            "version": "1.1.1"
+          },
+          "name": "sourceControlCheckout"
+        },
+        "subpath": "swift-system"
+      },
+      {
+        "basedOn": null,
+        "packageRef": {
+          "identity": "swift-tools-support-core",
+          "kind": "remoteSourceControl",
+          "location": "https://github.com/apple/swift-tools-support-core.git",
+          "name": "swift-tools-support-core"
+        },
+        "state": {
+          "checkoutState": {
+            "branch": "main",
+            "revision": "0220fc394f2ae820eeacd754fb2c7ce211e9979e"
+          },
+          "name": "sourceControlCheckout"
+        },
+        "subpath": "swift-tools-support-core"
+      },
+      {
+        "basedOn": null,
+        "packageRef": {
+          "identity": "yams",
+          "kind": "remoteSourceControl",
+          "location": "https://github.com/jpsim/Yams.git",
+          "name": "Yams"
+        },
+        "state": {
+          "checkoutState": {
+            "revision": "01835dc202670b5bb90d07f3eae41867e9ed29f6",
+            "version": "5.0.1"
+          },
+          "name": "sourceControlCheckout"
+        },
+        "subpath": "Yams"
+      }
+    ]
+  },
+  "version": 5
+}
diff --git a/pkgs/development/compilers/swift/sourcekit-lsp/patches/indexstore-db-macos-target.patch b/pkgs/development/compilers/swift/sourcekit-lsp/patches/indexstore-db-macos-target.patch
new file mode 100644
index 000000000000..53e790874d5d
--- /dev/null
+++ b/pkgs/development/compilers/swift/sourcekit-lsp/patches/indexstore-db-macos-target.patch
@@ -0,0 +1,12 @@
+Raise the deployment target of IndexStoreDB so it can link against our XCTest.
+
+--- a/Package.swift
++++ b/Package.swift
+@@ -4,6 +4,7 @@ import PackageDescription
+
+ let package = Package(
+   name: "IndexStoreDB",
++  platforms: [.macOS("10.12")],
+   products: [
+     .library(
+       name: "IndexStoreDB",
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 21c57e3e5480..069dd19ffec0 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -15042,7 +15042,7 @@ with pkgs;
   svdtools = callPackage ../development/embedded/svdtools { };
 
   swiftPackages = recurseIntoAttrs (callPackage ../development/compilers/swift { });
-  inherit (swiftPackages) swift swiftpm;
+  inherit (swiftPackages) swift swiftpm sourcekit-lsp;
 
   swiftpm2nix = callPackage ../development/tools/swiftpm2nix { };